Process of making sheet-metal preserving-cans.



m8573561 PATENTBDJUNE 25, 1907. J. G. HODG0N, PROCESS o? MAKING SHEET METAL PRESERVING cms; AIIPLIOA'ITION FILBD`M'AR.18, 1907.

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PATENTED JUNE 25, 1907.

l J. G. HODGSON. PROCESS 0F MAKING SHEET METAL PRESERVING GANS.

APPLIUATION FILED MAR. 18. 1907.

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iTnD sTATns PATENT onirica'.

JOHN G. HODGSON, OF MAYWOOD, ILLINOIS, vASSIGrNOR TO AMERICAN CAN COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

Specification of' Letters Patent.

Patented .nine 25, 1907.

Application nea March 18,1907. sean No. easia.

.To ri/,ZZ whom, it 17m/y concer-W* Be it known that I, JOHN G.- HoDGsoN, a citizen of the United States, residing in Maywood, in the county of Cook and State of Illinois, have invented a new and useful I rnprovement in the Art or Processes l'oft/Iannfacturing Sheet-Metal Preserving-Cans with Lacquer or Protective Coatings, 'of which the following is a specification.

Sheet metal preserving cans having lacquer or protective coatings on the inside to keep the food or other products within the can from direct contact with the tin plate and with the solder upon the inside of the can at the soldered searns or joints thereof, have heretofore been made eitherby spraying orv flowing over the inside surface of the can .(after the can is made) the lacquer or protective coating, or else by coating the sheets or blanks from which the can bodies and can. heads are made, while inthe fiat, with lacquer or other protectivecoating excepting at the narrow strips or portions thereof which form the seams Where the tin vplate is left free from lacquer or protective coating,`

so that the meeting surfaces may be soldered together. Both of these old methods or processes are, however, slow and expensive in operation, and resultin the production of defective 'and unsatisfactory lacquered or protective coated cans; the first because it is a slow and expensive operation to spray or iiow a coating film over the entire interior surface of a can after it is'made'up, and also a very tedious, difficult and expensive operation to properly dry or bake the coating on the interior of the can; and the coating thus produced isfrequently imperfect, however carefully the work mayl be done, owing to imperfections from' improperly covering the entire interior surface of the can with the harden. And the second or other method is l-slow, tedious, difficulty and expensive, be-

cause of the difficulty incident to applying the lacquer or protective coating to certain portions of the blank while leaving other portions yor narrow seam stripsuncoated; and because in the subsequent operation of solderingthe can seams the heat `of the soldering operation burnsland blisters off the lac dered seams, frequently leaving stripsv a half inch or more ,in width, not only substantially ofy the food yproducts 'preserved in the. can.

And in the preserving cans heretofore in use having lacquer -or protective co-atings on the inside, the coating has been of such 'character as to impart a more or less disagreeable odor, taste or flavor to the goods in the can.

The object of my invention is to providev a simple and efficient method or process of. rapidly andv cheapfy .manufacturing preserving 'cans having soldered'seams' an inside protective coatings, and by means of which the objections heretofore experienced may be enquer or protective coatings heretofore in use at the portions of the can adjacent to the soltirelyA obviated or overcome, and the cans be uniformly produced with' perfect or complete interior protective coatings ofanveflii cient, durable, odorless, tasteless, flavorless,v

harmless and sanitary character.

My invention consists in the` lmethod or process I have discovered for practically' accomplishing this objectl or result as herein'described; that is to say it consists in first coating the sheets of tin plate from which thecanV bodies and can heads are to be cut and formed throughout their whole surface on one or both sides with a protective lacquer coating, which will also operate as a flux in the subsequent soldering operation, the same consisting preferably of boiled linseed oil one part and turpentine two orl three parts; then baking or drying the coated sheets, preferably in an ovenor drier, at' a temperature of about 300 or 4000 Fht., for a period of two or three hours; then cutting 'and forming from .such protective coated sheets of tin plate the can bodies and can heads and can caps, in

the usual manner; then uxing and soldering the side seam of the can body; and thenl applying the can heads to the can body and luxing and soldering the headsthereon; and,v finally, after the cans have been filled, appl ing and soldering thereto the can caps. n cases Where the cans are of the open top variety and have the can heads secured to the can bodies not by solderedseams but b folded seanispthe step of soldering the hea s on'the can body is omitted, as well as the step of soldering the cap the top head after the roe B is the can body formed from the blankv A1, and having the customary side seam preferably a lock seam, and composed of oppositely turned, interlocked and compressed hooks or edge folds 1 bzw'vith the protective coating al extending into or through the seam. The. can-,head A2 has the customary integral flange atwith the protective coating.

a1 covering the same. The can cap A3 has the customary flaring flange 0L3 with the protective coating extending over or covering,

the same.

. As the protective coating 0,1 is of a flux# acting character, or of a characterthat does not interfere With soldering, the interposed protective coating 'al between the folds or members of the seamjdoes not interfere with the proper and perfect union of the seam members by the solder C. Before soldering the side seam of the can body and the end seams of the can, the seams, or the individual members or parts thereof to be joined are fluxedlkFor fluxing the seams I prefer to use aiifacid flux, although a rosin' flux may be-used. "If rosinflux is usedeit should be cut in turpentineinstead of in alcohol. The seams maybe-:soldered in the usual Way customarily :employed in solderingl cans the bodiesl and beads. of which. are of'tin plate Without any protective coating of any kind. The soldering isl done from the outside;

I that is to say in soldering the side seam the solder is applied to the outside of the seam, and if a soldering tool is employed to aid in l sweating the solder into the seam, itis also applied to the Aoutside of the can. If the fiange isapplied after the parts, folds or l members of the seam 'are assembled, the flux is also applied to the outside of the seams.

If desired however, the jiux Amay be applied 'to one or both parte to be joined before-the same are assembled. In the soldering the thin hlm or coating of linseed oil between the members of the seam, under action of the heat flux and sol-der apparently acts much the same as a thin hlm of still liquid acid,. resin or other ux acts in an ordinary sold er;

operation. At least my experiments have successfully demonstrated that this thin, dry, hard, solid protective coating of I interposed between the members does not interfere With the pro# duction-of strong, perfect and hermetically tight soldered seams or joints. l y

In the drawing it Will be understood tha-t the thickness of the tin plate'andOf the protective coating is greatly exaggerated for clearness ofillustration.

tasteless and odorless protective coatin s oir the inside, consisting in first coating s eets of tin plate in the flat throughout on one side with athin film or coating of boiled linseed.

oil and turpentine, then baking 'and drying the same, then cutting and forming the sheets intoV can bodies and can heads, then soldering the sideseam of the can body, then applying the can heads .to the can bodies,- and finally soldering the end seams of the jeans, substantially as specified.

2, he improvement in the art or process of-- .manufacturing sheet metal preserving cans With hard, solid, firmly adherent protective coatings on the inside, consisting in first coating sheets of tin plate in the flat throughout on one side With 'a fiux-acting coating material, then baking and dryingv the same, then cutting and forming can bodies and can heads from such sheets, then. soldering the side seam, and subsequently applying the can heads to the can bodies, substanti ally as specified. v

3. The process of manufacturing can bodies having protective coatings, consisting inV .rst coating sheets of tin plate in the flat With a flux-acting protective coating, and then cutting therefrom can' bodies with the protective coating extending to the extreme edges of the .can body blanks, then forming blanks into can bodies and soldering the side seams, substantially as specified.

4. The process of manufacturing can bodies having protectivecoatings, consisting in tak ing a can body blank in the flat having a nonmetallic protective coating thereon extending to the extreme edges thereof, forming the blank into a kcan body With the protective coating extending into the seam, and soldering its side seam, substantially as specified.

5. The process of manufacturing protective coated can bodies, consisting in taking a ESO can body blank having a hard, dry, firmly adherent flux-acting nonemetallic protective coating extending over the seam portion of the can body blank, forming the blankinto a can body with the protective coating extend. ing into the seam, and soldering the side seam thereof, substantially asspeciiied. 6. rEhe process of making protective coat@ ed .can bodies, consisting 1n taking a can bodv blank having a hard, solid, firmly adherent non-metallic protective coating extending over the seam portion of the blank, forming the saine into a can body with the protective coating extending into the seam.

and soldering the side seam thereof, substantially as specified.

7'. The process of making protective coated can bodies, consistingv in taking-- a canv body blank having a hard, dry, solid continuous linseed oil protective coating extending throughout the sea-in portion of the blank, forming said blank into a can body with the protective coating extending into the seam, and soldering the side seam, substantially as speciiied.

S. The process of protective coated bodies, consisting in taking a can body blank having a hard, dry, solid continuous linseed oil protective coating extending throughout the seam portion of the blank, forming said blank into a can body with the protective coating extending into the seam, and fluxing and soldering the side seam, substantially as specihed.

9. The process of ina-king protective coat ed cans, consisting in applying to a can body a can head. having a hard, dry, non-metallic protectivb coating on its inside extending over'the seaining flange and then lsold ring the end seam at the contacting innesnr aeg of the coated seaining flange, substantiegyj as specnied.

10. The process ot making protective coat\ ed cans with soldered end seains, consisting in applying to the can body a can head having a nonf ietallic protective coating extending over the inside surface of its flange :and then soldering the end seam at the contat ing inner surface of the coated seeming flange, substantially specified.

11. The improvement in the art or process of manufacturing sheet instal preserving cans having hard, solid, lirnily adherent, tasteless and odorless protective coatings on the inside, consisting in first coating sheets of tin pla-te in the flat throughout on one side with a thin nini or coating of boiled linseed oil and turpentine, then baking and drying the same, then cutting and Ytlniuing the sheets into can bodies and can heads, then soldering the side seams oli the can body, then applying'the can heads to the can bodies, soldering the end seams ot the cans, and then, after the cans have been i'illed applying and soldering to the top heads oi' the cans can tops having like preserv `ve coating on the inside thereol, substantially speciiied.

12. The improvement in the art or process of manufacturing sheet nietal preserving cans with hard, solid, iirrnly adherent protective coatings on the inside, consisting in first coating sheets ot tin plate in the llat throughout on one side h a ilusacting coating material, then baking and drying the saine, then cutting and forming can bodies and can heads troni suchsheets, then solder-. ing the side seams, subsequently applying the can heads to the can bodies, and then ai'ter the cans have been tilled applying and soldering to the t ,p heads ot the cans, can caps having a. like "i ective coa-ting on the inside thereof, sub iti ally as spcciiied.

13. rihe procesa consisting in applying to a esmas can a can ca having a hard, dry, non-inetallic protective coating on its inside extending over the seam portion of the cap, and then soldering the cap on the can at the inner contacting coated seein portion of the cap, substantially as specified.

la. rhe process consisting in applying to cans having a hard, dry, non-inetaIlic protective coating on the inside thereof, a can cap having a dry, hard, protective coating on its inside extending over the seam portion thereof, and then soldering the cap to the can at the inner contacting coated seam portion of the cap, substantially as specified.

15. The process oi making protective vcoatedcans, consisting in first applying to the tin plate sheets from which the parts oi the can' are to be lorinec: a protective coating of linseed oil, ther'drving the coating, then cutting and formingv the parts of the can parts and soldering the partstogether, substantially as specified. 16. The process of making soldered seains in cans Without causing the solder to coat or smear the inside surface ot the cans adjacent to the searn or seains, consisting in lirst pro viding the seam portion and adjacentportion of the can with a hard, dry, iluX-acting protective coating, and then soldering the the outside, seb..- yantially as speciiied.

17. The process of making 'i in cans without causing the solder to coat or sinear the inside surface ot the cans adjacent to the seam or seams, consisting in iirst providing the seam portion and adjacent portion ol.' the can with a hard, dry, flux-acting non-metallic protective coating, then iluxing the sealn and soldering the seain at the contacting protective coated portion thereof from the outside, substantially specilied.

18. T he process of making soldered seams in cans' without causing the solder to extend upon the inside surface of the cans adjacent to the seams, consisting in iirst coating the 'inside surface of the part or parts to be der-ed seams from such coated sheetsfthen assembling the IIO joined by the solder-senin with a hard, dry,

solid, protect-ive coating of' linseed oil, and then soldering the seain from the outside, substantially as specitied.

19. rlhe process ot making soldered seams in cans Without causing thc solder to extend. 

